<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
</head>
<body>
  <script>
    let obj = {
      name: '张三',
      age: 19,
      sex: '男',
      friends: ['王五', '王五1']
    }  

    let temp = {};
    // 进行浅拷贝
    Object.keys(obj).forEach(item => {
      temp[item] = obj[item];
    })

    
    console.log(temp)
    delete temp.friends

    console.log(temp)

    console.log(obj);
  </script>
</body>
</html>